I came across this site http://www.pocketstrings.com/, and I orderd a 6 fret version today. Shipment is expected by March. This is the perfect tool for us beginners. For example, when I take my daughter to her tutor and I am waiting in the car for her for about an hour, i can practice right in the car, waiting in the drs office, in traffic!! Not sure, but I think this can be a valuable tool to have.